72 temperature sending unit cross reference?
Thread Starter
4th Gear
Joined: Jan 2007
Posts: 4
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72 temperature sending unit cross reference?
I apologize if this has been covered; I couldn't find anything. I have a 72 small block. My new heads (Dart) have a 3/8" NPT port for the temperature sending unit. The OEM sending unit is 1/2" NPT. Does anyone know if there is a 3/8" temperature sending unit out there that will work?
Thank you,
David
Thank you,
David
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Here this one is cheap...
http://cgi.ebay.com/ebaymotors/STEWA...QQcmdZViewItem
...any Parts America stores, TSU64 is the GP Sorenson part number.
I don't know the GM part number yet but I'm still looking.
http://cgi.ebay.com/ebaymotors/STEWA...QQcmdZViewItem
...any Parts America stores, TSU64 is the GP Sorenson part number.
I don't know the GM part number yet but I'm still looking.
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Race Director
Joined: Jun 2000
Posts: 10,043
Likes: 674
From: FL
You need a sender with the right resistance so the gauge reads correctly. Using just any old 3/8" sender will get you wrong readings.
Contact Lectric Limited. www.lectriclimited.com They have senders with the correct resistance. They know what they correct resistance is for the C-3's (it varies by year as well) and could probably point you in the right direction.
Last option is to do what I did. Take the head to a machine shop and have them make the 3/8" NPT hole into a 1/2" NPT hole.
Contact Lectric Limited. www.lectriclimited.com They have senders with the correct resistance. They know what they correct resistance is for the C-3's (it varies by year as well) and could probably point you in the right direction.
Last option is to do what I did. Take the head to a machine shop and have them make the 3/8" NPT hole into a 1/2" NPT hole.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
I gave up, not realizing the thing would be such a bitch, and so put in a later say '99 Ford pickup sending unit, which is electrically differant...and took the square looking ceramic resistors off the back of my '72 gauge and dialed in something that works fairly close in the regions you are concerned about....180-220 are dead nutz on...
I did state the values once on this forum, so maybe do a search....I forget, and don't have info handy now....
I did state the values once on this forum, so maybe do a search....I forget, and don't have info handy now....
Melting Slicks
Joined: Nov 2001
Posts: 2,668
Likes: 43
From: Eastern US XX
I gave up, not realizing the thing would be such a bitch, and so put in a later say '99 Ford pickup sending unit, which is electrically differant...and took the square looking ceramic resistors off the back of my '72 gauge and dialed in something that works fairly close in the regions you are concerned about....180-220 are dead nutz on...
I did state the values once on this forum, so maybe do a search....I forget, and don't have info handy now....
I did state the values once on this forum, so maybe do a search....I forget, and don't have info handy now....
200 degrees = 90 ohms
180 degrees = 115 ohms
160 degrees = 140 ohms
120 degrees = 250 ohms
100 degrees = 340 ohms
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
This is a good option that can also be done in your own garage. Using the thread size of the sender go buy a drill bit and tap for that size. Tap it yourself.
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Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
That's great info. So you're supposed to use the highest degree mark on the gauge to check that list? So if my gauge reads to 200 I would want a 90 OHM sender?
